mtext_pop_prop -

       Copyright (C) 2001 Information-technology Promotion Agency (IPA)
       Copyright (C) 2001-2011 National Institute of Advanced Industrial Science and Technology (AIST)
       Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free
       Documentation License <http://www.gnu.org/licenses/fdl.html>.

Version 1.8.4                                    Mon Sep 25 2023                           mtext_pop_prop(3m17n)

       @brief Pop a text property.

       The mtext_pop_prop() function removes the topmost text property
       whose key is @b key from the characters between @b from (inclusive)
       and and @b to (exclusive) in @b mt.

       This function does nothing if characters in the region have no
       such text property. With this function,

                           FROM                    TO
       M-text: |<------------|-------- MT ---------|------------>|
       PROP  :  <------------------ OLD_VAL -------------------->

       becomes

                           FROM                    TO
       M-text: |<------------|-------- MT ---------|------------>|
       PROP  :  <--OLD_VAL-->|                     |<--OLD_VAL-->|

       @par Return value:
       If the operation was successful, mtext_pop_prop() return 0.
       Otherwise it returns -1 and assigns an error code to the external
       variable #merror_code.

       @par Errors:
       @c MERROR_RANGE, @c MERROR_SYMBOL

       @par See Also:
       mtext_put_prop(), mtext_put_prop_values(),
       mtext_get_prop(), mtext_get_prop_values(),
       mtext_push_prop(), mtext_prop_range()

       mtext_pop_prop -

       int mtext_pop_prop (MText * mt, int from, int to, MSymbol key)